Fossil fuels
Starter
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BURNING
CAPROCK
CHEMICAL
COAL
ENERGY
FIRE
FOSSILS
FUEL
HEAT
HEAT
LIGHT
OIL
PETROL
REMAINS
SMOKE
| P | R | K | C | O | R | P | A | C |
| L | I | G | H | T | L | G | H | O |
| O | S | N | I | A | M | E | R | A |
| R | M | V | W | P | M | Y | U | L |
| T | O | S | L | I | S | S | O | F |
| E | K | I | C | T | F | I | R | E |
| P | E | A | L | J | T | A | E | H |
| K | L | P | E | N | E | R | G | Y |
| G | N | I | N | R | U | B | K | L |
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